CN114835186B - Multifunctional energy-saving system of marine natural gas platform and control strategy thereof - Google Patents
Multifunctional energy-saving system of marine natural gas platform and control strategy thereof Download PDFInfo
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- CN114835186B CN114835186B CN202210483547.6A CN202210483547A CN114835186B CN 114835186 B CN114835186 B CN 114835186B CN 202210483547 A CN202210483547 A CN 202210483547A CN 114835186 B CN114835186 B CN 114835186B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000003345 natural gas Substances 0.000 title claims abstract description 32
- 238000011217 control strategy Methods 0.000 title claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 74
- 239000013535 sea water Substances 0.000 claims abstract description 70
- 239000012528 membrane Substances 0.000 claims abstract description 50
- 239000002122 magnetic nanoparticle Substances 0.000 claims abstract description 43
- 239000006200 vaporizer Substances 0.000 claims abstract description 42
- 239000003507 refrigerant Substances 0.000 claims abstract description 40
- 238000004821 distillation Methods 0.000 claims abstract description 33
- 239000013505 freshwater Substances 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 11
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- 230000026683 transduction Effects 0.000 claims description 19
- 238000010361 transduction Methods 0.000 claims description 19
- 239000003949 liquefied natural gas Substances 0.000 claims description 18
- 239000011521 glass Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 5
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a multifunctional energy-saving system of an ocean natural gas platform and a control strategy thereof, wherein the multifunctional energy-saving system comprises a solar photovoltaic system, a membrane distillation device, a liquefied gas tank, a vaporizer and a premix box; the vaporizer comprises two heat exchange pipelines, and the solar photovoltaic system heats seawater containing magnetic nano particles and working media by utilizing solar energy and then inputs the seawater into the membrane distillation device; the gas outlet of the membrane distillation device is communicated with the inlet of the heat exchanger; the liquid refrigerant working medium is input into one heat exchange pipeline, and the outlet of the heat exchanger is communicated with the other heat exchange pipeline; the liquid outlet of the membrane distillation device is communicated with a concentrated seawater treatment tank, and the concentrated seawater treatment tank is used for separating magnetic nano particles and working media from the concentrated seawater; the premixing box is communicated with the solar photovoltaic system, and the separated magnetic nano particles, working medium and seawater are respectively input into the premixing box. The invention heats the mixed seawater by utilizing solar energy and converts the mixed seawater into liquid fresh water, and the surplus energy in the collecting process is converted into electric energy.
Description
Technical Field
The invention relates to the field of offshore oil, in particular to a multifunctional energy-saving system of an offshore natural gas platform and a control strategy thereof.
Background
The ocean natural gas platform is an important component of the China petroleum industry, and with the continuous increase of the development force of ocean oil gas, the ocean oil gas yield gradually becomes an important source of the China oil gas yield. Ocean platforms are important equipment for ocean oil and gas development. The main component of liquefied natural gas is methane, which is recognized as the cleanest fossil energy source on the earth, and is colorless, odorless, nontoxic and noncorrosive.
LNG is a cryogenic medium with low temperature below-162 ℃, and gasification is an endothermic process, and a large amount of heat is required to be provided. The LNG vaporizer mainly comprises an empty bath type, a water bath type, an open frame type, an intermediate medium type and a submerged combustion type, wherein the two are used for vaporizing facilities (below 50 t/h) of a small-scale satellite station, the three types are common types of a large-scale LNG receiving station, and the vaporizing capacity is above 100 t/h. The existing ocean platform is provided with the seawater desalination equipment, but the seawater desalination equipment and the liquefaction equipment are mutually independent, so that the redundant energy in the seawater desalination process and the liquefaction process can not be recovered in time, and the utilization rate is reduced. In addition, conventional vaporizers often suffer from inadequate vaporization or incomplete vaporization of natural gas at the vaporization outlet.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a multifunctional energy-saving system of an ocean natural gas platform, which is characterized in that solar energy is utilized to heat the mixture of magnetic nano particles, working medium and seawater, and vapor generated by a membrane distillation device can be utilized to generate electric energy and be converted into liquid fresh water which can be input into a vaporizer to vaporize the liquid natural gas. And the working medium and the magnetic nano particles can be reused to save resources. In addition, the vaporizer comprises a first heat exchange pipeline and a second heat exchange pipeline, wherein the first heat exchange pipeline is positioned at the front part of the vaporizer, the second heat exchange pipeline is positioned at the rear part of the vaporizer, and heat exchange media with different parameters are communicated in different heat exchange pipelines, so that incomplete vaporized natural gas at the outlet of the vaporizer is avoided.
The present invention achieves the above technical object by the following means.
A multifunctional energy-saving system of an ocean natural gas platform comprises a solar photovoltaic system, a membrane distillation device, a liquefied gas tank, a vaporizer and a premix box;
the liquefied gas tank is used for storing liquefied natural gas, is communicated with the vaporizer through the pumping system, and converts the liquefied natural gas into gaseous natural gas through the vaporizer; the vaporizer comprises a first heat exchange pipeline and a second heat exchange pipeline, wherein the first heat exchange pipeline is positioned at the front part of the vaporizer, and the second heat exchange pipeline is positioned at the rear part of the vaporizer;
the solar photovoltaic system heats seawater containing magnetic nano particles and working media by utilizing solar energy and then inputs the seawater into a membrane distillation device for separating water vapor; the gas outlet of the membrane distillation device is communicated with the inlet of the heat exchanger through first transduction equipment; the medium in the cooling pipeline of the heat exchanger is a refrigerant working medium, the refrigerant working medium forms a gaseous refrigerant working medium in the heat exchange process, the gaseous refrigerant working medium is converted into a liquid refrigerant working medium through third energy conversion equipment at the outlet of the cooling pipeline of the heat exchanger, and the liquid refrigerant working medium is input into a first heat exchange pipeline or a second heat exchange pipeline and is used for enabling the refrigerant working medium to absorb cold energy; the outlet of the heat exchanger is communicated with the second heat exchange pipeline or the first heat exchange pipeline;
the liquid outlet of the membrane distillation device is communicated with a concentrated seawater treatment tank, and the concentrated seawater treatment tank is used for separating magnetic nano particles and working media from concentrated seawater; the premixing box is communicated with the solar photovoltaic system, and the separated magnetic nano particles, working medium and seawater are respectively input into the premixing box.
Further, the solar photovoltaic system comprises a frequency division flow channel, an air flow channel, a solar cell module and a cooling flow channel; the frequency division flow channel is communicated with the cooling flow channel; the solar cell module is arranged between the air flow channel and the cooling flow channel, can absorb solar radiation of partial wave bands for power generation, and is provided with the air flow channel between the high-permeability glass cover plate and the solar cell module; the seawater containing the magnetic nano particles and working medium is input into a cooling flow passage and is used for heating and evaporating the seawater by absorbing solar radiation of the residual wave band; the outlet of the frequency division flow passage is communicated with the membrane distillation device and is used for separating water vapor; the premix box is communicated with the cooling flow passage.
Further, the membrane distillation device comprises a feed liquid flow channel, a steam permeation membrane and a steam flow channel; the steam flow passage is communicated with a heat exchange pipeline of the vaporizer through first energy conversion equipment; the feed liquid runner inlet is communicated with the frequency division runner; a steam permeation membrane is arranged between the feed liquid flow channel and the steam flow channel and is used for separating steam; and the rest concentrated seawater containing the magnetic nano particles and working medium in the feed liquid flow passage is input into a concentrated seawater treatment tank.
Further, the magnetic nano-particles are ferroferric oxide nano-particles; the boiling point of the working medium is greater than that of water; the steam permeation membrane is a polytetrafluoroethylene membrane or a polyvinylidene fluoride membrane; and an insulation layer is arranged at the bottom of the cooling flow passage.
Further, the first heat exchange pipeline is a single-spiral heat exchange pipeline; the second heat exchange pipeline is a double-spiral heat exchange pipeline; the flow area of the single-spiral heat exchange pipeline is larger than that of the double-spiral heat exchange pipeline.
Further, the first energy conversion device comprises a first expander and a first generator, and the steam in the steam flow channel expands through the first expander to do work so as to drive the first generator to generate electric energy. The liquid outlet of the first expander is communicated with the inlet of the heat exchanger, and the outlet of the heat exchanger is communicated with fresh water supply equipment after flowing through a second heat exchange pipeline or a first heat exchange pipeline, so as to provide fresh water requirements on an ocean platform;
the third energy conversion device comprises a third expander and a third generator, and the gaseous refrigerant working medium expands and works through the third expander to drive the third generator to generate electric energy. And the liquid outlet of the third expander is communicated with the inlet of the first heat exchange pipeline or the second heat exchange pipeline.
Further, a heating device is arranged in the concentrated seawater treatment box, and the working medium is vaporized through the heating device; the vaporized working medium is input into the premix box after passing through a second transduction device, the second transduction device comprises a second expander and a second generator, and the vaporized working medium expands and works through the second expander to drive the second generator to generate electric energy. The liquid outlet of the second expander is communicated with the premix tank.
Further, the solar cell module absorbs solar radiation with the wavelength of 600-1100nm for generating electricity, the magnetic nano particles absorb solar radiation with the wavelength of below 600nm, and the seawater containing working media absorbs solar radiation with the wavelength of above 1100 nm.
The system further comprises a controller, a first three-way valve, a second three-way valve, a first temperature sensor, a second temperature sensor, a first flowmeter and a second flowmeter, wherein the first three-way valve is used for selectively enabling an outlet of the heat exchanger to be communicated with a second heat exchange pipeline or a first heat exchange pipeline; the second three-way valve is used for selectively enabling the outlet of the third transduction device to be communicated with a second heat exchange pipeline or a first heat exchange pipeline; the first temperature sensor is used for detecting the temperature of the outlet of the heat exchanger, the second temperature sensor is used for detecting the temperature of the outlet of the third transduction device, the first flowmeter is used for detecting the flow rate of the outlet of the heat exchanger, and the second flowmeter is used for detecting the flow rate of the outlet of the third transduction device;
the controller controls the first three-way valve and the second three-way valve according to detection values of the first temperature sensor, the second temperature sensor, the first flowmeter and the second flowmeter, so that an outlet of the third energy conversion device is communicated with the second heat exchange pipeline and an outlet of the heat exchanger is communicated with the first heat exchange pipeline, or an outlet of the third energy conversion device is communicated with the first heat exchange pipeline and an outlet of the heat exchanger is communicated with the second heat exchange pipeline.
A control strategy for a multifunctional energy-saving system of an ocean natural gas platform, comprising the steps of:
detecting the temperature of the outlet of the heat exchanger to be T through a first temperature sensor 1 The method comprises the steps of carrying out a first treatment on the surface of the Detecting the temperature of the liquid outlet of the third expander as T through the second temperature sensor 2 ；
Detecting flow Q at the outlet of a heat exchanger by a first flow meter 1 Detecting the flow rate Q of the liquid outlet of the third expander by the second flowmeter 2 ；
When T is 1 ＞T 2 And Q is 1 ＞Q 2 When the controller controls the first three-way valve to enable the outlet of the heat exchanger to be communicated with the first heat exchange pipeline, and controls the second three-way valve to enable the liquid outlet of the third expander to be communicated with the second heat exchange pipeline;
when T is 1 ＜T 2 And Q is 1 ＜Q 2 When the controller controls the first three-way valve to enable the outlet of the heat exchanger to be communicated with the second heat exchange pipeline, and controls the second three-way valve to enable the liquid outlet of the third expander to be communicated with the first heat exchange pipeline;
when T is 1 ＞T 2 And Q is 1 ＜Q 2 When the delta T is smaller than the set value, the controller controls the first three-way valve to enable the outlet of the heat exchanger to be communicated with the second heat exchange pipeline, and controls the second three-way valve to enable the liquid outlet of the third expander to be communicated with the first heat exchange pipeline; if delta T is larger than the set value, the controller controls the first three-way valve to enable the outlet of the heat exchanger to be communicated with the first heat exchange pipeline, and controls the second three-way valve to enable the liquid outlet of the third expander to be communicated with the second heat exchange pipeline;
when T is 1 ＜T 2 And Q is 1 ＞Q 2 When the delta T is smaller than the set value, the controller controls the first three-way valve to enable the outlet of the heat exchanger to be communicated with the first heat exchange pipeline, and controls the second three-way valve to enable the liquid outlet of the third expander to be communicated with the second heat exchange pipeline; if delta T is larger than the set value, the controller controls the first three-way valve to enable the outlet of the heat exchanger to be communicated with the second heat exchange pipeline, and controls the second three-way valve to enable the liquid outlet of the third expander to be communicated with the first heat exchange pipeline; deltaT= |T 1 -T 2 ∣。
The invention has the beneficial effects that:
1. the multifunctional energy-saving system of the marine natural gas platform provided by the invention has the advantages that the solar energy is utilized to heat the mixture containing the magnetic nano particles, the working medium and the seawater, the vapor generated by the membrane distillation device can be utilized to generate electric energy and is converted into liquid fresh water, and the liquid fresh water can be used for being input into the vaporizer to vaporize the liquid natural gas.
2. According to the multifunctional energy-saving system of the marine natural gas platform, the temperature of the vaporized working medium is high, and the working medium is converted into electric energy through the transduction equipment and is collected.
3. The multifunctional energy-saving system of the marine natural gas platform has the advantages that the seawater containing the magnetic nano particles and the working medium has the frequency division function, the problem of thermal coupling of the traditional solar photovoltaic photo-thermal system can be solved, the seawater without the magnetic nano particles is used as the direct contact type membrane distillation Cheng Liao liquid flow, the heat conductivity coefficient and the boundary layer heat transfer rate can be improved, the thickness of a hot boundary layer at the feed liquid side is reduced, the phenomenon that the membrane distillation is Cheng Wencha polarized is reduced, and the fresh water yield is improved. In addition, the magnetic nano particles and the working medium can be recycled in the later period, and the working medium can also generate electric energy.
4. After selective absorption and frequency division of seawater containing magnetic nano particles and working medium, the battery assembly outputs electric energy by utilizing solar power generation with the wavelength of 600-1100nm, solar radiation energy in other wave bands and waste heat produced by the battery are absorbed by the seawater containing the magnetic nano particles and the working medium, so that heat required by a membrane distillation process is provided, and full-spectrum utilization of solar energy is realized.
5. Compared with the existing solar driven membrane distillation system, the multifunctional energy-saving system of the marine natural gas platform does not need an additional solar heat collector and a heat exchanger, is simple in device, can reduce heat loss, can provide multipath electric energy and fresh water at the same time, and is high in system integration level.
6. The vaporizer comprises a first heat exchange pipeline and a second heat exchange pipeline, wherein the first heat exchange pipeline is positioned at the front part of the vaporizer, the second heat exchange pipeline is positioned at the rear part of the vaporizer, and a controller controls a valve to enable heat exchange media with different parameters to be communicated in the first heat exchange pipeline and the second heat exchange pipeline according to the temperature and flow parameters of an output medium, so that incomplete vaporized natural gas at an outlet of the vaporizer is avoided.
Drawings
Fig. 1 is a schematic diagram of a multifunctional energy-saving system of an ocean natural gas platform according to the invention.
Fig. 2 is a schematic view of a carburetor.
In the figure:
1-a liquefied gas tank; 2-vaporizer; 3-a fresh water storage tank; 4-a client; 5-a first expander; 6-a first generator; 7-a solar photovoltaic system; 7-1-a first high transmission glass cover plate; 7-2-frequency division flow channels; 7-3-a second high transmission glass cover plate; 7-4-air flow channels; 7-5-solar cell modules; 7-6-cooling flow channels; 7-7 of a heat preservation layer; 8-a first pump; 9-a second expander; 10-a second generator; 11-membrane distillation apparatus; 11-1-a feed liquid runner; 11-2-vapor-permeable membrane; 11-3-steam flow path; 12-a concentrated seawater treatment tank; 13-a premix tank; 14-air conditioning refrigeration equipment; 15-a third expander; 16-a third generator; 17-a heat exchanger; 18-a first three-way valve; 19-a second three-way valve; 20-a third three-way valve; 21-a fourth three-way valve; 2-1-double spiral heat exchange pipeline; 2-2-single spiral heat exchange pipeline.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1, the multifunctional energy-saving system of the marine natural gas platform comprises a liquefied gas tank 1, a vaporizer 2, a first transduction device, a solar photovoltaic system 7 and a membrane distillation device 11; the liquefied natural gas is stored in the liquefied gas tank 1, the liquefied gas tank 1 is communicated with the vaporizer 2 through a pumping system, the liquefied natural gas is converted into gaseous natural gas through the vaporizer 2, and an outlet of the vaporizer 2 is transmitted to a client 4 in a natural gas platform. The vaporizer 2 comprises a first heat exchange pipeline and a second heat exchange pipeline, wherein the first heat exchange pipeline is positioned at the front part of the vaporizer 2, and the second heat exchange pipeline is positioned at the rear part of the vaporizer 2;
the solar photovoltaic system 7 comprises a first high-transmittance glass cover plate 7-1, a frequency division flow passage 7-2, a second high-transmittance glass cover plate 7-3, an air flow passage 7-4, a solar cell module 7-5, a cooling flow passage 7-6 and an insulating layer 7-7; the solar cell module 7-5 is arranged between the air flow channel 7-4 and the cooling flow channel 7-6, the solar cell module 7-5 can absorb 600-1100nm wavelength solar radiation for generating electricity, and the generated electric energy is provided for electric equipment or an energy storage device. The premixing box 13 is internally provided with magnetic nano particles, working medium and seawater, the mixed seawater is pressurized by the first pump 8 and is input into the cooling flow channel 7-6, the solar cell module 7-5 is cooled, and the mixed seawater is preheated; the frequency division flow channel 7-2 is arranged between the first high-permeability glass cover plate 7-1 and the second high-permeability glass cover plate 7-3, the frequency division flow channel 7-2 is communicated with the outlet of the cooling flow channel 7-6, seawater containing magnetic nano particles and working media enters the frequency division flow channel 7-2 from the cooling flow channel 7-6 to selectively absorb and divide sunlight, the magnetic nano particles can absorb solar radiation with the wavelength below 600nm, the seawater containing the working media can absorb solar radiation with the wavelength above 1100nm, and the seawater can be further heated. The solar cell module 7-5 adopts a monocrystalline silicon cell module. The first high-permeability glass cover plate 7-1 and the second high-permeability glass cover plate 7-3 are quartz glass or borosilicate glass. The bottom of the cooling flow passage 7-6 is provided with an insulating layer 7-7 for heat preservation.
The membrane distillation device 11 comprises a feed liquid flow channel 11-1, a steam permeation membrane 11-2 and a steam flow channel 11-3; the feed liquid runner 11-1 is communicated with the frequency division runner 7-2, the steam permeation membrane 11-2 is positioned between the feed liquid runner 11-1 and the steam runner 11-3 and is used for separating steam, the steam is input into the first transduction device after being separated, the residual concentrated seawater containing magnetic nano particles and working media in the feed liquid runner 11-1 is input into the concentrated seawater treatment tank 12, a heating device is arranged in the concentrated seawater treatment tank 12 and is used for vaporizing the working media, the vaporized working media can be directly input into the premix tank 13, the residual concentrated seawater containing the magnetic nano particles is separated out by using the characteristics of the magnetic nano particles through external magnetic force application equipment, and the magnetic nano particles are added into the premix tank 13 again. The remaining concentrated seawater can be used for salt production or discharged into the ocean.
The seawater containing the magnetic nano particles and the working medium is a nano fluid formed by dispersing the ferroferric oxide nano particles into a mixed solution of the seawater and the working medium. The vapor-permeable membrane 11-2 is a polytetrafluoroethylene membrane or a polyvinylidene fluoride membrane.
The first energy conversion device comprises a first expander 5 and a first generator 6, and high-temperature and high-pressure water vapor expands through the first expander 5 to do work so as to drive the first generator 6 to generate electric energy. Because the outlet of the first expander 5 is high-temperature liquid, the high-temperature liquid is input into the heat exchanger 17, a medium in a cooling pipeline of the heat exchanger 17 is a refrigerant working medium, the refrigerant working medium forms a gaseous refrigerant working medium in the heat exchange process, and the outlet of the cooling pipeline of the heat exchanger 17 converts the gaseous refrigerant working medium into a liquid refrigerant working medium through third energy conversion equipment; the liquid refrigerant working medium is used for enabling the refrigerant working medium to absorb cold energy through the second three-way valve 19 and the first heat exchange pipeline or the second heat exchange pipeline, so that the cold energy can be reused; the outlet of the heat exchanger 17 is communicated with a second heat exchange pipeline or a first heat exchange pipeline through a first three-way valve 18; the liquid refrigerant working medium flows out through the first heat exchange pipeline or the second heat exchange pipeline and then is communicated with the air conditioner refrigeration equipment 14; the fresh water at the outlet of the heat exchanger 17 flows out through the first heat exchange pipeline or the second heat exchange pipeline and then is communicated with fresh water supply equipment, so that the fresh water on the ocean platform is needed.
The third energy conversion device comprises a third expander 15 and a third generator 16, and the gaseous refrigerant working medium expands and works through the third expander 15 to drive the third generator 16 to generate electric energy. The liquid outlet of the third expander 15 is in communication with the inlet of the first heat exchange line or the second heat exchange line.
Working principle:
sunlight sequentially passes through the first high-transmittance glass cover plate 7-1, the frequency division flow channel 7-2 and the second high-transmittance glass cover plate 7-3, the air layer 7-4 irradiates the surface of the solar cell module 7-5, 600-1100nm wavelength solar radiation is absorbed by the cell to be mostly converted into electric energy, and the electric energy can be used by the first pump 8 or other equipment or connected with an energy storage device to store the electric energy, and the small part of solar radiation is converted into cell waste heat. The premixing box 13 is internally mixed with magnetic nano particles, working medium and seawater, the mixed seawater is pressurized by the first pump 8 and is input into the cooling flow channel 7-6, waste heat generated by the solar cell module 7-5 is absorbed for preheating after entering the cooling flow channel 7-6, so that the cell temperature is reduced, the photoelectric conversion efficiency of the cell is improved, solar light is selectively absorbed and divided by flowing into the frequency dividing flow channel 7-2, the magnetic nano particles can absorb solar radiation with the wavelength below 600nm, the seawater containing the working medium can absorb solar radiation with the wavelength above 1100nm, and the solar radiation with the wavelength of the wavelength is absorbed by the seawater containing the magnetic nano particles and the working medium for converting into high-grade heat energy. The magnetic nano fluid formed by the ferroferric oxide nano particles is added into the seawater, so that the purpose of solar spectrum frequency division is achieved, the temperature required by the membrane distillation process is directly achieved by heating, secondary heat exchange is avoided, and heat loss is reduced. After flowing out of the frequency division flow channel 7-2, the seawater containing the magnetic nano particles and the working medium directly enters the feed liquid flow channel 11-1, water vapor is generated at a boundary layer contacted with the vapor transmission membrane 11-2, the water vapor passes through the vapor transmission membrane 11-2 to reach the vapor flow channel 11-3, and the water vapor enters the first expander 5 from the vapor flow channel 11-3 to expand and do work to drive the first generator 6 to generate electric energy. The fresh water with temperature output from the liquid outlet of the first expander 5 is communicated with the inlet of the heat exchanger 17 through a second pump for reducing the temperature of the fresh water. Assuming that the chilled fresh water is communicated with the second heat exchange line via the first three-way valve 18, the second heat exchange line outlet is in communication with a fresh water supply for providing fresh water demand on the ocean platform. The medium in the cooling pipeline of the heat exchanger 17 is a refrigerant working medium, the refrigerant working medium forms a gaseous refrigerant working medium in the heat exchange process, and the outlet of the cooling pipeline of the heat exchanger 17 converts the gaseous refrigerant working medium into a liquid refrigerant working medium through third energy conversion equipment; the liquid refrigerant is communicated with the first heat exchange pipeline through the second three-way valve 19, so that the refrigerant absorbs cold energy, and the first heat exchange pipeline is communicated with the air conditioner refrigerating equipment 14, so that the refrigerant is recycled in the air conditioner refrigerating equipment. The refrigerant working medium can be a single refrigerant or a mixed refrigerant, and the boiling point of the refrigerant working medium is generally between 5 and 25 degrees.
The seawater containing the working medium in the feed liquid flow channel 11-1 is input into the concentrated seawater treatment tank 12, the working medium is vaporized by distillation or heating of the heating equipment, and the vaporized working medium can be directly input into the premixing tank 13; the residual concentrated seawater containing the magnetic nano particles is separated by using the characteristics of the magnetic nano particles through external magnetic force application equipment, and the magnetic nano particles can be added into the premix box 13 again for recycling. The concentrated seawater remaining after distillation or heating can be used for salt production or discharged into the ocean. The seawater containing the ferroferric oxide nano particles improves the heat conductivity coefficient and the boundary layer heat transfer rate of the seawater, reduces the thickness of a thermal boundary layer, reduces Cheng Wencha polarization of the traditional direct contact type membrane distillation and improves the membrane flux.
The vaporized working medium has higher temperature, and if the working medium directly enters the seawater in the premix tank 13, the self heat energy of the working medium can be wasted. And thus the vaporized working medium is input into the second transduction equipment to generate electric energy. The second energy conversion device comprises a second expander 9 and a second generator 10, and the vaporized working medium expands and works through the second expander 9 to drive the second generator 10 to generate electric energy. The liquid outlet of the second expander 9 is directly communicated with the premix tank 13, and the cooled liquid working medium enters the premix tank 13.
The multifunctional energy-saving system of the marine natural gas platform has the advantages that the seawater containing the magnetic nano particles and the working medium has the frequency division function, the problem of thermal coupling of the traditional solar photovoltaic photo-thermal system can be solved, the seawater without the magnetic nano particles is used as the direct contact type membrane distillation Cheng Liao liquid flow, the heat conductivity coefficient and the boundary layer heat transfer rate can be improved, the thickness of a hot boundary layer at the feed liquid side is reduced, the phenomenon that the membrane distillation is Cheng Wencha polarized is reduced, and the fresh water yield is improved. In addition, the magnetic nano particles and the working medium can be recycled in the later period, and the working medium can also generate electric energy. Compared with the existing solar driven membrane distillation system, the solar driven membrane distillation system does not need an additional solar heat collector and a heat exchanger, is simple in device, can reduce heat loss, simultaneously provides multipath electric energy and fresh water, and has high system integration level.
In order to avoid or reduce the existence of incompletely vaporized natural gas at the outlet of the vaporizer, the control strategy of the multifunctional energy-saving system of the marine natural gas platform comprises a controller, a first three-way valve 18, a second three-way valve 19, a third three-way valve 20, a fourth three-way valve 21, a first temperature sensor, a second temperature sensor, a first flowmeter and a second flowmeter, wherein the first three-way valve 18 is used for selectively enabling the outlet of the heat exchanger 17 to be communicated with a second heat exchange pipeline or a first heat exchange pipeline; the second three-way valve 19 is used for selectively enabling the outlet of the third transduction device to be communicated with a second heat exchange pipeline or a first heat exchange pipeline; the third three-way valve 20 is used for selectively enabling the outlet of the first heat exchange pipeline to be communicated with the fresh water storage tank 3 or the air conditioning and refrigerating equipment 14; the fourth three-way valve 21 is used for selectively enabling the outlet of the second heat exchange pipeline to be communicated with the fresh water storage tank 3 or the air conditioning refrigeration equipment 14; the first temperature sensor is used for detecting the temperature of the outlet of the heat exchanger 17, the second temperature sensor is used for detecting the temperature of the outlet of the third transduction device, the first flowmeter is used for detecting the flow rate of the outlet of the heat exchanger 17, and the second flowmeter is used for detecting the flow rate of the outlet of the third transduction device; the first heat exchange pipeline is a single-spiral heat exchange pipeline 2-1; the second heat exchange pipeline is a double-spiral heat exchange pipeline 2-2; the flow area of the single-spiral heat exchange pipeline 2-1 is larger than that of the double-spiral heat exchange pipeline 2-2. The axial length of the single-spiral heat exchange pipeline 2-1 is 2-3 times of that of the double-spiral heat exchange pipeline 2-2.
The controller controls the first three-way valve 18 and the second three-way valve 19 according to the detection values of the first temperature sensor, the second temperature sensor, the first flowmeter and the second flowmeter, so that the outlet of the third energy conversion device is communicated with the double-spiral heat exchange pipeline 2-2 and the outlet of the heat exchanger 17 is communicated with the single-spiral heat exchange pipeline 2-1, or the outlet of the third energy conversion device is communicated with the single-spiral heat exchange pipeline 2-1 and the outlet of the heat exchanger 17 is communicated with the double-spiral heat exchange pipeline 2-2.
The method comprises the following steps:
the temperature at the outlet of the heat exchanger 17 is detected as T by a first temperature sensor 1 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the liquid outlet of the third expander 15 is detected as T by the second temperature sensor 2 ；
Detecting the flow Q at the outlet of the heat exchanger 17 by means of a first flow meter 1 The flow rate Q of the liquid outlet of the third expander 15 is detected by the second flow meter 2 ；
When T is 1 ＞T 2 And Q is 1 ＞Q 2 When the controller controls the firstA three-way valve 18 communicates the outlet of the heat exchanger 17 with the single-spiral heat exchange pipeline 2-1, and the controller controls the second three-way valve 19 to communicate the liquid outlet of the third expander 15 with the double-spiral heat exchange pipeline 2-2; the controller controls the third three-way valve 20 to enable the outlet of the single-spiral heat exchange pipeline 2-1 to be communicated with the fresh water storage tank 3; the controller controls the fourth three-way valve 21 to enable the outlet of the double-spiral heat exchange pipeline 2-2 to be communicated with the air-conditioning refrigeration equipment 14;
when T is 1 ＜T 2 And Q is 1 ＜Q 2 When the controller controls the first three-way valve 18 to enable the outlet of the heat exchanger 17 to be communicated with the double-spiral heat exchange pipeline 2-2, and controls the second three-way valve 19 to enable the liquid outlet of the third expander 15 to be communicated with the single-spiral heat exchange pipeline 2-1; the controller controls the third three-way valve 20 to enable the outlet of the single-spiral heat exchange pipeline 2-1 to be communicated with the air-conditioning refrigeration equipment 14; the controller controls a fourth three-way valve 21 to enable the outlet of the double-spiral heat exchange pipeline 2-2 to be communicated with the fresh water storage tank 3; the medium with high heat exchange speed and high temperature is firstly utilized to primarily exchange heat at the front end of the vaporizer to ensure vaporization of most liquid natural gas, and then the medium with low heat exchange speed and low temperature is utilized to exchange heat at the rear end of the vaporizer again to ensure vaporization of all liquid natural gas.
When T is 1 ＞T 2 And Q is 1 ＜Q 2 When DeltaT is smaller than the set value, the controller controls the first three-way valve 18 to enable the outlet of the heat exchanger 17 to be communicated with the double-spiral heat exchange pipeline 2-2, and controls the second three-way valve 19 to enable the liquid outlet of the third expander 15 to be communicated with the single-spiral heat exchange pipeline 2-1; the controller controls the third three-way valve 20 to enable the outlet of the single-spiral heat exchange pipeline 2-1 to be communicated with the air-conditioning refrigeration equipment 14; the controller controls a fourth three-way valve 21 to enable the outlet of the double-spiral heat exchange pipeline 2-2 to be communicated with the fresh water storage tank 3; if DeltaT is larger than the set value, the controller controls the first three-way valve 18 to enable the outlet of the heat exchanger 17 to be communicated with the single-spiral heat exchange pipeline 2-1, and controls the second three-way valve 19 to enable the liquid outlet of the third expander 15 to be communicated with the double-spiral heat exchange pipeline 2-2; the controller controls the third three-way valve 20 to enable the outlet of the single-spiral heat exchange pipeline 2-1 to be communicated with the fresh water storage tank 3; the controller controls the fourth three-way valve 21 to change the double helixThe outlet of the hot pipeline 2-2 is communicated with the air conditioner refrigeration equipment 14; the liquid refrigerant working medium with high heat exchange speed and low temperature is preferentially utilized to primarily exchange heat at the front end of the vaporizer, so that vaporization of most liquid natural gas is ensured, and then fresh water with low heat exchange speed and high temperature is utilized to exchange heat at the rear end of the vaporizer again, so that vaporization of all liquid natural gas is ensured. DeltaT= |T 1 -T 2 ∣。
When T is 1 ＜T 2 And Q is 1 ＞Q 2 When DeltaT is smaller than the set value, the controller controls the first three-way valve 18 to enable the outlet of the heat exchanger 17 to be communicated with the single-spiral heat exchange pipeline 2-1, and controls the second three-way valve 19 to enable the liquid outlet of the third expander 15 to be communicated with the double-spiral heat exchange pipeline 2-2; the controller controls the third three-way valve 20 to enable the outlet of the single-spiral heat exchange pipeline 2-1 to be communicated with the fresh water storage tank 3; the controller controls the fourth three-way valve 21 to enable the outlet of the double-spiral heat exchange pipeline 2-2 to be communicated with the air-conditioning refrigeration equipment 14; if DeltaT is larger than the set value, the controller controls the first three-way valve 18 to enable the outlet of the heat exchanger 17 to be communicated with the double-spiral heat exchange pipeline 2-2, and controls the second three-way valve 19 to enable the liquid outlet of the third expander 15 to be communicated with the single-spiral heat exchange pipeline 2-1; the controller controls the third three-way valve 20 to enable the outlet of the single-spiral heat exchange pipeline 2-1 to be communicated with the air-conditioning refrigeration equipment 14; the controller controls the fourth three-way valve 21 to enable the outlet of the double-spiral heat exchange pipeline 2-2 to be communicated with the fresh water storage tank 3. The fresh water with high heat exchange speed and low temperature is used for primarily exchanging heat at the front end of the vaporizer to ensure vaporization of most liquid natural gas, and then the liquid refrigerant with low heat exchange speed and high temperature is used for secondarily exchanging heat at the rear end of the vaporizer to ensure vaporization of all liquid natural gas.
It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. The multifunctional energy-saving system of the marine natural gas platform is characterized by comprising a solar photovoltaic system (7), a membrane distillation device (11), a liquefied gas tank (1), a vaporizer (2) and a premix tank (13);
the liquefied gas tank (1) is used for storing liquefied natural gas, the liquefied gas tank (1) is communicated with the vaporizer (2) through a pumping system, and the liquefied natural gas is converted into gaseous natural gas through the vaporizer (2); the vaporizer (2) comprises a first heat exchange pipeline and a second heat exchange pipeline, wherein the first heat exchange pipeline is positioned at the front part of the vaporizer (2), and the second heat exchange pipeline is positioned at the rear part of the vaporizer (2); the first heat exchange pipeline is a single-spiral heat exchange pipeline; the second heat exchange pipeline is a double-spiral heat exchange pipeline; the flow area of the single-spiral heat exchange pipeline is larger than that of the double-spiral heat exchange pipeline;
the solar photovoltaic system (7) heats seawater containing magnetic nano particles and working media by utilizing solar energy and then inputs the seawater into the membrane distillation device (11) for separating water vapor; the gas outlet of the membrane distillation device (11) is communicated with the inlet of the heat exchanger (17) through first transduction equipment; the medium in the cooling pipeline of the heat exchanger (17) is a refrigerant working medium, the refrigerant working medium forms a gaseous refrigerant working medium in the heat exchange process, the outlet of the cooling pipeline of the heat exchanger (17) converts the gaseous refrigerant working medium into a liquid refrigerant working medium through third energy conversion equipment, and the liquid refrigerant working medium is input into a first heat exchange pipeline or a second heat exchange pipeline and is used for enabling the refrigerant working medium to absorb cold energy; the outlet of the heat exchanger (17) is communicated with a second heat exchange pipeline or a first heat exchange pipeline;
the liquid outlet of the membrane distillation device (11) is communicated with a concentrated seawater treatment tank (12), and the concentrated seawater treatment tank (12) is used for separating magnetic nano particles and working media from concentrated seawater; the premixing box (13) is communicated with the solar photovoltaic system (7), and the separated magnetic nano particles, working medium and seawater are respectively input into the premixing box (13);
the system further comprises a controller, a first three-way valve (18), a second three-way valve (19), a first temperature sensor, a second temperature sensor, a first flowmeter and a second flowmeter, wherein the first three-way valve (18) is used for selectively enabling the outlet of the heat exchanger (17) to be communicated with a second heat exchange pipeline or a first heat exchange pipeline; the second three-way valve (19) is used for selectively enabling the outlet of the third transduction device to be communicated with a second heat exchange pipeline or a first heat exchange pipeline; the first temperature sensor is used for detecting the temperature of the outlet of the heat exchanger (17), the second temperature sensor is used for detecting the temperature of the outlet of the third transduction device, the first flowmeter is used for detecting the flow rate of the outlet of the heat exchanger (17), and the second flowmeter is used for detecting the flow rate of the outlet of the third transduction device;
the controller controls the first three-way valve (18) and the second three-way valve (19) according to detection values of the first temperature sensor, the second temperature sensor, the first flowmeter and the second flowmeter, so that an outlet of the third transduction device is communicated with the second heat exchange pipeline and an outlet of the heat exchanger (17) is communicated with the first heat exchange pipeline, or the outlet of the third transduction device is communicated with the first heat exchange pipeline and an outlet of the heat exchanger (17) is communicated with the second heat exchange pipeline.
2. The multi-functional energy saving system of a marine natural gas platform according to claim 1, characterized in that the solar photovoltaic system (7) comprises a crossover runner (7-2), an air runner (7-4), a solar cell module (7-5) and a cooling runner (7-6); the frequency division flow channel (7-2) is communicated with the cooling flow channel (7-6); the solar cell module (7-5) can absorb solar radiation of partial wave bands for power generation, and an air flow channel (7-4) is arranged between the high-permeability glass cover plate and the solar cell module (7-5); the seawater containing the magnetic nano particles and working medium is input into a cooling flow passage (7-6) and is used for heating and evaporating the seawater by absorbing solar radiation of the residual wave band; the outlet of the frequency division flow passage (7-2) is communicated with the membrane distillation device (11) and is used for separating water vapor; the premixing box (13) is communicated with the cooling flow passage (7-6).
3. The multifunctional energy-saving system of the marine natural gas platform according to claim 2, wherein the membrane distillation device (11) comprises a feed liquid flow channel (11-1), a steam permeation membrane (11-2) and a steam flow channel (11-3); the steam flow passage (11-3) is communicated with a heat exchange pipeline of the vaporizer (2) through first energy conversion equipment; the inlet of the feed liquid runner (11-1) is communicated with the frequency division runner (7-2); a steam permeation membrane (11-2) is arranged between the feed liquid flow channel (11-1) and the steam flow channel (11-3) and is used for separating steam; the residual concentrated seawater containing the magnetic nano particles and the working medium in the feed liquid flow passage (11-1) is input into a concentrated seawater treatment box (12).
4. A multi-functional energy-saving system of a marine natural gas platform according to claim 3, wherein the magnetic nanoparticles are ferroferric oxide nanoparticles; the boiling point of the working medium is greater than that of water; the steam permeation membrane (11-2) is a polytetrafluoroethylene membrane or a polyvinylidene fluoride membrane; the bottom of the cooling flow passage (7-6) is provided with an insulating layer (7-7).
5. The multifunctional energy-saving system of the marine natural gas platform according to claim 4, wherein the first energy-converting equipment comprises a first expander (5) and a first generator (6), and the water vapor in the steam flow channel (11-3) expands through the first expander (5) to apply work to drive the first generator (6) to generate electric energy; the liquid outlet of the first expander (5) is communicated with the inlet of the heat exchanger (17), and the outlet of the heat exchanger (17) is communicated with fresh water supply equipment after flowing through a second heat exchange pipeline or a first heat exchange pipeline, so as to provide fresh water requirements on an ocean platform;
the third energy conversion equipment comprises a third expander (15) and a third generator (16), and the gaseous refrigerant working medium expands through the third expander (15) to do work so as to drive the third generator (16) to generate electric energy; the liquid outlet of the third expander (15) is communicated with the inlet of the first heat exchange pipeline or the second heat exchange pipeline.
6. The multifunctional energy-saving system of the marine natural gas platform according to any one of claims 1 to 4, characterized in that a heating device is arranged in the concentrated seawater treatment tank (12), and working medium is vaporized by the heating device; the vaporized working medium is input into a premixing box (13) after passing through second energy conversion equipment, the second energy conversion equipment comprises a second expander (9) and a second generator (10), and the vaporized working medium expands and works through the second expander (9) to drive the second generator (10) to generate electric energy; the liquid outlet of the second expander (9) is communicated with the premixing box (13).
7. The multifunctional energy saving system of a marine natural gas platform according to any of claims 2-4, characterized in that the solar cell module (7-5) absorbs 600-1100nm wavelength solar radiation for power generation, the magnetic nanoparticles absorb below 600nm wavelength solar radiation, and the working medium containing seawater absorbs above 1100nm wavelength solar radiation.
8. A control strategy for a multi-functional energy saving system for an offshore natural gas platform according to claim 1, comprising the steps of:
the temperature at the outlet of the heat exchanger (17) is detected as T by a first temperature sensor 1 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the liquid outlet of the third expander (15) is detected as T by a second temperature sensor 2 ；
Detecting the flow Q of the outlet of the heat exchanger (17) by means of a first flow meter 1 Detecting the flow rate Q of the liquid outlet of the third expander (15) by the second flowmeter 2 ；
When T is 1 ＞T 2 And Q is 1 ＞Q 2 When the controller controls the first three-way valve (18) to enable the outlet of the heat exchanger (17) to be communicated with the first heat exchange pipeline, and controls the second three-way valve (19) to enable the liquid outlet of the third expander (15) to be communicated with the second heat exchange pipeline;
when T is 1 ＜T 2 And Q is 1 ＜Q 2 When the controller controls the first three-way valve (18) to enable the outlet of the heat exchanger (17) to be communicated with the second heat exchange pipeline, and controls the second three-way valve (19) to enable the liquid outlet of the third expander (15) to be communicated with the first heat exchange pipeline;
when T is 1 ＞T 2 And Q is 1 ＜Q 2 When the delta T is smaller than the set value, the controller controls the first three-way valve (18) to enable the outlet of the heat exchanger (17) to be communicated with the second heat exchange pipeline, and controls the second three-way valve (19) to enable the liquid outlet of the third expander (15) to be communicated with the first heat exchange pipeline; if DeltaT is larger than a set value, the controller controls the first three-way valve (18) to enable the outlet of the heat exchanger (17) to be communicated with the first heat exchange pipeline, and controls the second three-way valve (19) to enable the liquid outlet of the third expander (15) to be communicated with the second heat exchange pipeline;
when T is 1 ＜T 2 And Q is 1 ＞Q 2 When the delta T is smaller than the set value, the controller controls the first three-way valve (18) to enable the outlet of the heat exchanger (17) to be communicated with the first heat exchange pipeline, and controls the second three-way valve (19) to enable the liquid outlet of the third expander (15) to be communicated with the second heat exchange pipeline; if DeltaT is larger than a set value, the controller controls the first three-way valve (18) to enable the outlet of the heat exchanger (17) to be communicated with the second heat exchange pipeline, and controls the second three-way valve (19) to enable the liquid outlet of the third expander (15) to be communicated with the first heat exchange pipeline;
△T=∣T 1 -T 2 ∣。
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